Talking about the lvl 35 G25 and lvl 37 RBZ, both seem quite equal, and both would only be interim due to their trajectory.
My 2 Pfennig: Wait for the lvl 59 G25s, the first high trajectory clubs available. Before updating from you lvl 10 irons, you should upgrade from the Starter wedges. Get two short ATVs (lvl 39), they will help you tremendously. A good 3WD might be a budget alternative to a driver.